Can Gut Dysbiosis Cause Anxiety & Depression?

EPISODE # 56

Can Gut Dysbiosis Cause Anxiety & Depression? What the Science Actually Says

Understanding the gut–brain connection

Could an imbalanced gut microbiome be contributing to anxiety or low mood? In this episode of The Histamine Well Podcast, Joanne explores the connection between gut dysbiosis and mental health—and what the research actually tells us.

Joanne breaks down how the gut and brain communicate through the vagus nerve, inflammation, stress hormones and compounds produced by gut bacteria. She also explains why the often-quoted claim that most serotonin is made in the gut doesn’t tell the whole story.

The episode looks at the evidence linking the microbiome to anxiety and depression, including the potential benefits and limitations of probiotics. Joanne discusses why claims about “leaky gut” causing anxiety go beyond what researchers can currently confirm.

You’ll also learn how dietary diversity, sleep, movement and stress management fit into a broader approach to gut and mental health, with considerations for people with histamine intolerance. Supporting the gut may play a role, but it does not replace appropriate mental health care.

Topics covered include:

What gut dysbiosis is and what can contribute to it
The five key pathways connecting the gut and brain
Gut serotonin, tryptophan and common misconceptions
What probiotic research tells us about anxiety and depression
Intestinal permeability: association versus causation
Practical gut support and considerations for histamine intolerance

Stay well,

Joanne Kennedy

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